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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2003 YZ450F "ColdBlooded Issue"
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[QUOTE="oldguy, post: 1393679, member: 16965"] Messsing with the main jet will do nothing for starting as it doesn't kick in until the revs are up. The backfiring on decel more then likely means you are to lean on the pilot. If you have to turn the fuel screw more than 3/4 turn above or below 1 1/2 turns out you need a new pilot jet sized that direction. We had a similar problem with an 07 250F where the pilot was way to rich and the bike would only fire if cold and then had to be bump started once hot. The power was perfect as were the vlaves [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2003 YZ450F "ColdBlooded Issue"
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